第一代马桶支架的设计，在打印上过于费时复杂，在一段时间的售卖之后，我设计了第二代马桶支架，并开源了第一代产品。有打印机的用户可以通过社区，自助打印这个第一代马桶支架。收到了不少国际版社区中海外用户的好评。
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This type is optimized for DateTimes that may require some datetime arithmetic in which the daylight saving transition could potentially cause problems. ZonedDateTime can take those transitions into account when doing any addition or subtraction of time (see example below).
def close(self) - None:
"We are also working closely with partners to improve the River Wandle, an urban river facing multiple pollution challenges. This includes progressing the fish‑pass scheme at Goatbridge and developing further fish‑passage and river‑restoration projects in Beddington Park."